Electrical connecting system and parts



March 24, 1970 w. R. EVANS Re. 26,837

ELECTRICAL CONNECTING SYSTEM AND PARTS Original Filed Aug. 16, 1963 9Sheets-Sheet 1 March 24, 1970 w. R. EVANS ELECTRICAL CONNECTING SYSTEMAND PARTS Original Filed Aug. 16, 1963 9 Sheets-Sheet 9 March 24, 1970w. R. EVANS ELECTRICAL commcwme SYSTEM AND mm 9 Sheets-Sheet 5 OriginalFiled Aug. 16, 1963 ZMU March 24, 1970 w. R. EVANS Re. 26,837

ELECTRICAL CONNECTING SYSTEM AND PARTS Original Filed Aug. 16, 1963 9Sheets-Sheet 4 March 24, 1970 w. R. EVANS Re. 26,837

ELECTRICAL CONNECTING SYSTEM AND PARTS Original Filed Aug. 16, 1963 9Sheets-Sheet 5 March 24, 1970 w EVANS Re. 26,837

ELECTRICAL CONNECTING SYSTEM AND PARTS Original Filed Aug. 16, 1963 9Sheets-Sheet 6 March 24, 1970 w. R. EVANS ELECTRICAL CONNECTING SYSTEMAND PARTS 9 Sheets-Sheet 7 Original Filed Aug. 16, 1963 March 24, 1970w, EVANS Re. 26,837

ELECTRICAL CONNECTING SYSTEM AND PARTS Original Filed Aug. 16, 1953 9Sheets-Shae: s

J H c] 2T1 11a March 24, 1970 w. R. EVANS ELECTRICAL GONNECTING SYSTEMAND PARTS 9 Sheets-Sheet 9 Original Filed Aug. 16, 1963 United StatesPatent 26,837 ELECTRICAL CONNECTING SYSTEM AND PARTS William RobertEvans, Hershey, Pa., assignor to AMP Incorporated, Harrisburg, Pa.

Original No. 3,270,251, dated Aug. 30, 1966, Ser. No. 302,653, Aug. 16,1963. Application for reissue July 17, 1968, Ser. No. 747,031

Int. Cl. H02b 1/04, 9/00; Hk 1/00 US. Cl. 317101 30 Claims Matterenclosed in heavy brackets appears in the original patent but forms nopart of this reissue specification; matter priuted in italics indicatesthe additions made by reissue.

ABSTRACT OF THE DISCLOSURE Electrical connecting means for connectingone or more electrical modules having electrical components thereon tocircuit means comprising female contacts associated with a module boardand connected to the circuitry on the module board, and male contactsextending from an insulating base and insertable longitudinally throughpassages extending completely through the female contacts. The femalecontacts are of generally closed, box-like configuration having opposedspring tongues for engaging the male contacts.

This invention relates to an electrical connecting sys tem, and, moreparticularly, to an electrical connecting system by which relativelyinexpensive modules may be quickly and effectively connected toconductors on primary circuit means, such as so-called mother cards orboards.

Although there are certain electrical connecting sys terns now availablefor interconnecting relatively ex-- pensive module units to primarysecond conductors carried by various types of supporting means, it isthe principal purpose of the present invention to provide relativelyinexpensive module means by which, for example, the electricalcomponents comprising the modules may be mounted upon suitable sizes ofprinted circuit boards and directly connected to the conductors thereon.The invention also includes unique male and female connectorsrespectively employed on the modules and primary circuit means, saidconductors being relatively flexible in the adaptation thereof to manydifferent kinds of circuits, and particularly for permitting thestacking or sandwiching of a plurality of modules upon each other andbeing capable of quick interconnection commonly to substantial lengthsof male contacts, for example, which pass successively through a seriesof female contacts respectively carried by the module boards.

It is another object of the invention to provide contact arrangementswhich may be mounted suitably either upon insulating sheet-typesupporting members, such as printed circuit boards, or steel chassis, aswell as the same being adapted to point-to-point wiring techniques.

A further object of the invention is to so construct especially thefemale contacts that they are easily and quickly connected to modulemembers comprising printed circuit cards or boards, simply by insertingtines on the female contacts in punched holes formed in the card orboard, and then clinching and soldering the projecting ends of the tinesto circuit conductors on the cards or boards, said female contacts alsobeing preferably of a rectangular cross-section and open from end toend, whereby male contact prongs or tabs may be arranged to pass throughsuitable openings in the printed circuit card or board and then bereceived within the hollow or tubular female contact to effect a circuitconnection therewith.

As a corollary to the foregoing object, it is a further object to soarrange the female contacts and the tines thereon that said contactsreadily either may be connected with the axes thereof perpendicular, orparallel, to the plane of the printed circuit card or board, therebypermitting the latter to be plugged and thus be connected to a primarycircuit means when extending either edgewise or parallel to said primarycircuit means.

Still another object of the invention is to provide unique male contactswhich, essentially, are preferably substantially H-shaped and arestamped from suitable sheet metal, and the opposite ends of the sides ofthe male contacts may be connected to primary circuit means, such as theso-called mother-card, which may be formed either of insulating materialor steel, through the employment of simple molded base members to whichthe male contacts are connected directly, the male contacts beingprogrammable by selectively shearing or snipping certain prongs or tabstherefrom which are not required for a specific application and suchformation of male contact permits the same to be adapted to a widevariety of interconnection of circuits on module boards or cards, forexample.

A still further object of the invention is to provide connecting meanson the female contacts in such manner that said contacts may be mountedon the same surface of the modular printed circuit card or board as theelectrical components of the module are mounted, whereby the conductorsof the module are on the opposite surface of the card or board, and theleads from the electrical components, as well as the tines forconnecting the female contacts to the board, extend through suitableholes or openings in the board and thereby permit the firm connection ofthe projecting ends of the leads or tines to the circuit conductors onsaid opposite side of the board by clinching and soldering. Suchconnection advantageously may be made through flow solder or dip-soldertechniques.

Still another object of the invention is to form especially the femalecontacts from a blanked strip or ribbon of resilient metal andcomprising marginal strips between which contact unit blanks extendtransversely and, depending upon whether the connecting tines of thecontacts are to be all at one end or the other, for vertical mounting ofthe contact with respect to a supporting board, or both of the contactsare to extend transversely from one side thereof at opposite ends forparallel mounting of the contact relative to its supporting board, saidcontact unit blanks may be severed, as desired, from said blank stripsselectively to provide the arrangement of tines desired on the femalecontact simply by bending the contact unit blanks when severed from theblanked strip into a tubular configuration, thereby minimizing cost ofproduction of female contacts of tubular type and having at least threedifferent possible arrangements of tines thereon for selectivepositioning of the contacts relative to a supporting base board.

As a corollary to the foregoing object, it is another object to form afemale contact which is substantially rectangular in cross-section andopen from end to end by folding the contact unit blanks into suchconfiguration and abutting the opposite edges of the blanks into contactwith each other along one side of the female contact and at least onetine, which is split, extends from such split side of the contact,whereby upon insertion of said split tine within a hole in the mountingboard, separation of the abutting edges of the split tine and split sideof the female contact is prevented effectively and inexpensively.

Details of the foregoing objects and of the invention, as well as otherobjects thereof, are set forth in the following specification andillustrated in the accompanying drawings comprising a part thereof.

In the drawings:

FIG. 1 is a fragmentary, exploded perspective view showing an electricalsystem embodying several dilferent module assemblies connected toprimary circuit means, and particularly illustrating a varied stackingarrangement permissible by the present invention, the modules beingsubstantially parallel to each other and the primary circuit means inthis view.

FIG. 2 is a fragmentary, perspective view illustrating a plurality ofmodule units connected in parallel arrangement with respect to eachother, but perpendicular to the primary circuit means, whereby themodules effect a socalled edge connection to the primary circuit means.

FIGS. 3, 4 and 5 respectively show different possible arrangements ofunique type of male contact provided by the invention and shownsupported by a suitable base or chassis means.

FIG. 6 is a fragmentary, perspective view of two module cards or boardsconnected by shorting bars.

FIG. 7 is a vertical sectional view of a fragmentarily illustratedsupporting plate and insulating base members supporting variousarrangements of male contacts so as to project from opposite surfaces ofthe supporting plate member.

FIG. 8 is an edge view of a stacked series of module boards commonlyconnected to continuous male contacts or shorting bars of suitablelength, which extend through a series of female contacts on the moduleboards, this view also illustrating fragmentary portions of additionalmodule boards, or the like, connected edgewise to certain of the stackedmodule boards, some of the contacts of said additional module boardsbeing illustrated in exploded manner with respect to the stacked moduleboards.

FIG. 9 is a fragmentary, vertical elevation showing a male contact orshorting bar of substantial length upon which a series of so-calledflag-type female contacts are mounted, one of the latter being shown inexploded manner in position to be connected to the male contact member.

FIG. 10 is a fragmentary, vertical sectional view illustrating anarrangement of interconnected module boards mounted upon a chassis plateto which a series of male contacts and/or insulating base members areconnected.

FIG. 11 is a fragmentary, vertical sectional view of still anotherarrangement of module boards positioned in numerous locations withrespect to each other and a basic chassis plate upon which male contactsand their insulating supporting members are mounted, certain of themodule boards and electrical connecting means being shown in explodedmanner.

FIG. 12 is another fragmentary, vertical sectional view of a basicchassis supporting plate upon which a number of different arrangementsof male contacts and their insulating base members are mounted, certainof these being connected to foreshortened, exemplary module boards, thisview particularly showing certain types of connecting means for securingthe insulating base members to the chassis plate formed of metal andfrom which the male contacts are suitably insulated.

FIG. 13 is a foreshortened view illustrating a number of differentarrangements and configurations of male contacts supported by theirinsulating base members on fragmentarily shown and foreshortenedsections of chassis base plate means, the examples of male contactsbeing still different from those shown in the other figures.

FIG. 14 is an end view showing a series of module boards having femalecontacts arranged thereon in parallelism to the board and a differentarrangement of male contact or shorting bar, as illustratedfragmentarily in position to be inserted in the edge-mounted femalecontacts on the module boards.

FIGS. 15 through 17 respectively are perspective views of the femalecontacts comprising part of the present invention, the securing tinesfor the contacts each being shown in different relationship with respectto the same in these different views, primarily to illustrate thesubstantial scope of the type of female contact construction provided bythe present invention.

FIGS. 18 through 20 show the contact unit blanks from which the contactsof FIGS. 15 through 17 are formed, there being illustrated on each ofthese figures broken lines showing where portions of the blanks aresevered to provide the different configurations of connecting tinesillustrated on the female contacts in FIGS. 15 through 17.

FIG. 21 is a fragmentary section of a blanked strip illustrating themanner in which the contact unit blanks of FIGS. 18 through 20 areformed initially.

FIG. 22 is a fragmentary, exploded view of a so-called card to wireconnector assembly employing the female contacts of the invention inappropriately molded housings and arranged to receive male contactsdirectly connected at one end to wires and the male contacts beingsuitably mounted within a molded housing.

FIG. 23 is a fragmentary, vertical sectional view of the embodiment ofthe invention shown in FIG. 22 and illustrated in exploded manner withthe male contact about to be positioned within the female contact,

In FIG. 1, a module 10 is illustrated, the same comprising a suitablesize of printed circuit board 12, the conductors being on the reversesurface thereof from that upon which the electrical components 14 and 16are mounted in the module 10 shown in the upper portion of said figure.However, to illustrate the substantial latitude of the application ofthe present invention, there is illustrated, in the lower portion ofFIG. 1, another similar module 10, which is positioned with the oppositesurface of the printed circuit board uppermost and upon said oppositesurface thereof will be seen fiat, ribbon-type conductors 18 which aresimilar to or identical with the conductors on the opposite surface ofthe uppermost module 10a from that surface which is illustrated inFIG. 1. Still another similar module 10 is shown in fragmentary mannerin the lower right-hand portion of FIG. 1.

One of the principal features of the present invention comprises thefemale contacts 20. Rows of these contacts are illustrated in the module10 of FIG. 1 respectively adjacent opposite edges of the printed circuitboard 12 thereof, the contacts being mounted in vertical orperpendicular position with respect to board 12. These Contacts arepreferably substantially rectangular in cross-section, as readily can bevisualized from FIG. 1, and passages 22 extend through the femalecontacts from end to end for ready reception of the tabs 24 of the malecontacts 26, the male contacts preferably being substantially H-shaped,as is best seen adjacent the left-hand side of FIG. 1. As will bedescribed in greater detail hereinafter, the male contacts 26 aresupported by suitable insulating base members 28, these being mountedupon a primary supporting plate 30 which, as desired or required, may beeither a sheet of metal comprising part of a chassis of an appropriateelectrical unit, or a sheet of insulation material, which, if desired,may have conductors mounted on one or both surfaces thereof or not.

One of the advantages of the present invention is that the male contacts26 may be provided with tabs 24 extending in opposite directions fromeach other and respectively vertical to opposite surfaces of thesupporting plate 30, as clearly is shown in FIG. 1. One use of such typeof male contacts is to employ them as shorting or circuitconnectinmembers extending between, for example,

female contacts on several different modules, whereby the male contactscomprise couplers or circuit-coupling means. A substantial advantage ofsuch an arrangement is that, in accordance with the principles of theinvention, the tabs 24 may project through suitable holes or openingsformed in the printed circuit boards 12 in axial alignment with thepassages 22 of the female contacts 20, whereby the tabs 24 extendthrough the boards for engagement with the female contacts by extendingtherethrough.

To illustrate substantial possibilities of the interconnectability ofvarious modules in accordance with the present invention, it will beseen from FIG. 1 that, adjacent the left-hand side thereof, a series ofmale contacts 26 are provided on primary supporting plate 30, thesehaving tabs 24 extending in opposite directions. The opposite sides ofeach of the male contacts 26 each afford a pair of tabs and thetransverse bar 32 of the male contacts interconnect the opposite sidesthereof. Thus, one row of tabs 24 is shown engaging the female contacts20 of a small, fragmentary portion of a module adjacent the left-handedge of FIG. 1, while the uppermost module 10 in FIG. 1 is in positionto be placed upon the opposite row of tabs 24 of the same row of malecontacts. Similarly, the lowermost module 10 is in position to have theleft-hand row of female contacts connected to one row of male tabs 24extending below primary supporting plate 30.

Further, the insulating base member 28 adjacent the right-hand edge ofFIG. 1 is provided with two rows of upstanding tabs 24, one row of whichis already connected to the female contacts 20 of the module 10 in thelower right-hand corner of FIG. I, while the other row is in position toengage the female contacts 20 on the opposite edge of the uppermostmodule 10. This latter row of tabs 24 also has an oppositely extendingrow of tabs projecting downward therefrom, though it is not possible toillustrate the same in FIG. 1 without confusion, for reception in thepassages of the female contacts 20 adjacent the righthand edge of thelowermost module 10.

While the female contacts 20 have been illustrated with the passages 22thereof extending substantially vertically to the plane of the printedcircuit boards 12 in the arrangement shown in FIG. 1, FIG. 2 is providedto illustrate a series of modules 10 comprising printed circuit boardsupon which the female contacts 20 are mounted with the passages 22thereof substantially parallel to each other and the printed circuitboards of the module, whereby the printed circuit boards may beconnected edgewise to the tabs 24 projecting upward from the insulatingbase members 28 mounted upon primary supporting plate 30. In addition,shorting bars 34, which may be generally U- shaped, may be arranged withthe opposite ends thereof inserted into opposed pairs of female contacts20', as clearly shown in FIG. 2, thereby affording additional selectivecircuit connections. Not only do the shorting bars provide desiredelectrical connections, but they also brace the upper edges of thevertically mounted modules.

Referring to FIGS. 3 through 5, three different arrangements of modifiedmale contacts 26 are shown, these not being intended to be restrictivein any way, since many other possibilities can be visualized. Thesearrangements illustrate the wide versatility made possible through theuse of an H-shaped male contact providing, for example, a maximum offour tabs 24, a transverse bar 32, which may remain intact or besevered, as shown in FIG. 3, for example, and any unneeded tabs 24 maybe extended by simply snipping the same from the male contact prior toconnection of the same to the insulating base member 28 which is tosupport the male contacts. Further to facilitate the connection of themale contacts to the base members 28, there preferably are providedseveral clinching lugs or tabs 36, which extend from the transverse bar32 and by means of which not only are the male contacts secured to thebase members 28, but the latter also are secured to the primarysupporting plate 30 thereby, for example.

In the illustrations shown in FIGS. 3 through 5, it also is to beconsidered that the supporting plate 30 may be either of insulatingmaterial, or metallic. If metallic, it will be seen that the plate isprovided with a suitable opening 38 extending therethrough for thereception of a suitable broad extension 40 formed on one face of thebase member 28, thereby effectively positioning the base member 28 withrespect to the supporting plate 30. Cooperating with the base member 28in each of the constructions shown in FIGS. 3 through 5 is a clampingplate 42, preferably of insulating, sheet-like material, through whichthe clinching lugs 36 of the male contacts extend to complete theaffixing and positioning of the male contacts with respect to theprimary supporting plate 30. Plate 42 may, if desired, be a printedcircuit board. However, this manner of securing the male contacts tosuch primary supporting plate is only one of a number of connecting andpositioning means afforded by the present invention, details of otherexamples of which are described hereinafter and illustrated insucceeding figures of the drawings.

In the embodiment of male contact supporting and positioning means shownin FIG. 7, it will be seen that insulating base members 44 are shown,which are different from the base members 28 in FIGS. 3 through 5.Further, still somewhat different shapes or proportions of the samebasic type of male contacts 26 are illustrated in FIG. 7, but, in theleft-hand arrangement, the oppositely projecting tabs 24 are notconnected to each other, although the pairs of tabs 24 projecting fromthe same base members 44 are connected by means of transverse bars 32.Further, the clinching lugs 36 on the male contacts are employed toaffix the modified male contacts respectively to their base members 44and, under such circumstances, the base members 44, which are mounted onopposite surfaces of the primary supporting plate 30, are connected toeach other and to said plate by auxiliary connecting means, notspecifically illustrated, such as bolts, hollow rivets, or otherwise.

In both the left-hand and right-hand arrangement of insulating basemembers 44 in FIG. 7, it will be seen that there are broad extensions 46formed on the inner faces of the base members 44 respectively forreception within openings 38 formed in the supporting plate 30. As inregard also to the insulating base members 28 of FIGS. 3 through 5, thebase members 44 of the embodiment shown in FIG. 7 are preferably formedby molding from suitable synthetic resin, or the like, and provided withappropriate recesses complementary to the male contacts for thereception thereof readily in such manner that the tabs 24 projecttherefrom as and where desired. By way of further example of malecontact arrangement, it will be seen that the right-hand male contact 26in FIG. 7 is provided with continuous opposed tabs 24 comprisingopposite sides of the H-shaped contacts, whereby aligned pairs of saidtabs extend entirely through the adjacent pairs of base members 44, aswell as through the opening 38 in the supporting plate 30, the broadextensions 46 surrounding the tabs to provide ample insulation therefor,especially if the supporting plate 30 is metallic.

Connecting the arrangement shown in FIG. 6 fragmentary portions of apair of modules 10 are shown provided with exemplary groupings of femalecontacts 20" between which shorting bars 48 extend, or, if desired, saidshorting bars may actually comprise the equivalent of male contactmembers employed for purposes of stacking a series of modulesinterconnected through the medium of such shorting bars 48.

A more elaborate stacking arrangement than is illustrated in FIG. 6 isshown in FIG. 8, especially to illustrate the principle made possible bythe present invention that shorting bars 48 of substantially indefinitelength may be employed to extend commonly through aligned series offemale contacts respectively mounted at any desired location on modules10. Further, while certain of the illustrated female contacts 20 shownin FIG. 8 are disposed perpendicularly to the circuit boards of themodules, there are other female contacts 20', adjacent the righthand sidof FIG. 8, positioned with the axes thereof parallel to the boards ofthe modules 10, whereby various modified forms of male contact tabs 50,52 and 54 respectively may be connected to the female contacts, the tabbeing illustrated in engagement with its female contact, whereas tabs 52and 54 are positioned to be inserted in selected female contacts 20.Also, as can readily be seen from FIG. 8, the tabs 50, 52 and 54respectively may be connected to different types of electrical means tobe interconnected to the modules 10, certain exemplary showings ofdifferent electrical means respectively being connected to said tabs.Spring prong 55 struck out of tab 54 renders it suitable for dispositionin a connector block for gauged mating, all as is well understood in theart.

In FIG. 9-, a supporting base plate 56 is shown in fragmentary manner,the same having either a shorting or connecting bar 58 connected at oneend to base plate 56. If desired, said end of the shorting bar may beconnected to a suitable conductor carried by base plate 56. Theprincipal purpose of the arrangement in FIG. 9 is to illustrat howcircuit wires 60 may be interconnected together through the medium offemale contacts 20"", which have so-called flag-type terminals 62thereon, which are crimped or clinched around ends of the wires 60,whereby a series of the female contacts 20' may be slidably placed uponthe shorting bar or elongated male contact 58 so as to interconnect allof the wires 60 together, as well as connecting the same to any circuitconductor which may he carried by base plate 56.

Still another arrangement made possible by the present invention isillustrated in FIG. 10 in which, for example, a metallic supportingplate 64 commonly supports a series of insulating base members 28 of thetype shown in FIGS. 3 through 5, which are secured to supporting plates64 by clamping plates 42 and clinching lugs 36 of the male contactsagainst the same. It will be seen that an exemplary number of modules 10are connected to certain upwardly extending tabs 24 of the various malecontacts, whereby the modules are interconnected to each other throughthe medium of said contacts, certain of the male contacts being unitary,while others are divided, all to illustrate latitude in the applicationof the invention to specific demands of certain circuit arrangements.Further, a jumper or shorting conduit 66 may be provided withslip-connectors 68, which slidably and frictionally engage tabs 24 ofthe male contacts.

A still further arrangement of interconneced modules employing malecontacts of the type provided by the present invention is shown in FIG.11. However, in this arrangement, the supporting means preferablycomprises a non-metallic or insulating base plate 70 to which theinsulating base members 28 may be directly connected without any specialmeans to insulate the male contacts 26 thereof from each other, as isnecessary in regard to the arrangement shown in FIG. 10 wherein ametallic base plate is employed.

The arrangement illustrated in FIG. 11 also includes various otherinnovations provided by the present invention, such as the use of femalecontacts 20", substantially of the so-callcd flag-type, as shown in FIG.9, and having clinching type terminals 62 thereon for purposes ofconnecting a flexible shorting conduit 72 between the tabs 24 of twodifferent male contacts 26. Still another flexible shorting conduit 74is shown in the upper portion of the figure with clinched type terminals76 connected to opposite ends of the conduit 74, said terminals beingaffixed to male contact tabs 78, which are of suitable size to bereceived within selected female contacts 20 respec tively carried bydifferent modules 10, for example.

Further in FIG. 11, still another type module 80 is shown, the samehaving female contacts 20" and 20 connected thereto respectively invertical and parallel relationship to the board of said module. Saidboard is arranged so that said female contacts thereon may be receivedupon an upstanding male contact tab 24 and a. horizontal shorting bar82, the opposite end of which is connected to a female contact 20" atthe upper edge of a vertical module 84, the lower edge of which isdisposed vertically with respect to the adjacent insulating base member28 from which a tab 24 of its male contact 26 extends.

At the extreme right-hand end of FIG. 11 still a different connectormeans is illustrated for purposes of coupling a wire 86 to a verticaltab 24 through the medium of a female contact 20" of the flag-type andhaving a clinch-type terminal 62 thereon, which engages an exposed endof the wire 86. Further, said female contact 20" preferably is enclosedin an insulating sleeve 88 to facilitate the connection of the femalecontact 20' with the male contact tab 24 under suitable insulatedconditions. A similar insulating sleeve 90 is shown in the upperleft-hand corner of FIG. 11 in association with a male contact 78connected to a wire 92, the male contact 78 being receivable in a femalecontact 20 on the adjacent module 10.

In FIGS. 12 and 13, still further arrangements of insulating basemembers are shown in association with metallic supporting plates forpurposes of insulating the male contacts from each other and from saidmetallic supporting plate. Referring specifically to the details shownin these figures, it will be seen that the metallic supporting plate 94is provided with a plurality of rows of holes 96, or, if desired, theholes may be interconnected in the nature of a slot through whichsimilar insulating collar extensions 97 project from the inner faces ofinsulating base members 98 extend so as to form insulation for the tabs24, and especially the longitudinally connected, oppositely extendingtabs on the male contacts 26. The insulating base members 98, which aredisposed on opposite surfaces of the metallic supporting plate 94 areconnected together and to said supporting plate by suitable means, suchas hollow rivets 100. Otherwise, in general, the insulating base members98 function similarly to the above-described insulating base members 28with respect to supporting the male contacts 26, the latter beingprovided with clinching lugs 36, which engage the insulating basemembers 98 suitably to prevent accidental separation of the malecontacts therefrom. As also will be seen in FIG. 12, exemplary modules10 are provided with the same type of female contacts 20 for connectionto the tabs 24 of the male contacts 26.

One of the principal purposes of FIGS. 12 and 13 is to show stilldifferent arrangements of modified male contacts 26 from those shown inthe preceding figures. It will be observed that even contacts havingonly one or two tabs 24 may be arranged, as circuit requirements demand,yet the contacts effectively are supported by the insulating basemembers 98 so as readily to remain affixed to their supporting plates 94incident to modules 10 being connected to and disconnected therefrom. Tofacilitate the understanding of certain of these illustrations, theinsulating base members 98 are provided with recesses 102, whichpreferably snugly engage either the tabs 24 or the transverse bars 32 ofthe male contacts 26. However, when certain of the tabs 24 or portionsof the transverse bars 32 are removed, in accordance with circuitrequirements, at least portions of the recesses 102 will be unoccupied,as is shown in portions of the structure illustrated in FIGS. 12 and 13.

Further to illustrate the versatility of the present invention, there isillustrated in FIG. 14 a plurality of substantially parallel modules 10having rows of female contacts 20' connected along opposite edgesthereof, for example, all of the contacts 20' adjacent the same ends ofthe modules 10 being connectable by an elongated shorting bar 104 havinga plurality of appropriately spaced tabs 106 extending therefrom forreception within the passages in the female contacts 20' so as toconnect the circuit means on the modules 10, which are associated withthe female contacts 20'.

Another important aspect of the present invention comprises theparticular construction of the female contacts. A number of differentembodiments of such contacts are afforded by the present invention,although all of them embrace the same basic structure, the principaldifferences being the arrangement of connecting tines which are providedon the different arrangements. Preferably, the contacts are formed fromresilient sheet material, a blanked strip or ribbon being formed fromsuch material for purposes of forming contact unit blanks 108. Afragmentary portion of the blanked strip 110 is shown in FIG. 21, and itwill be seen that small webs 112 connect the contact unit blanks 108with margin strips 114.

One of the principal virtues of the contact unit blanks 108 is thatthrough the special design of said blank, any one of the different typesof female contacts 20, 20' and 20", respectively shown in FIGS. 15through 17, may be formed therefrom, thereby minimizing expense,simplification of die structure, and a saving in material.

The unit blanks 108 each comprise three long parallel transverseportions of which the intermediate portion 116 is substantially twice aswide as the outer portions 118. The unit blanks 108 also comprise a pairof shorter transverse portions 120, which are parallel to and interposedbetween the longer transverse portions 116 or 118. The shorter portions120 are interconnected adjacent the opposite ends thereof to the longertransverse portions 116 and 118 by short hinge sections 122, shown inFIG. 21, respectively adjacent opposite ends of the shorter portions120. There also are terminal strap portions 124 extending between theouter and intermediate long transverse portions 116 and 118.

After the blanked strip 110 is formed, the short hinge sections 122adjacent one end of the shorter portions 120 are severed by slits whichare parallel to the shorter portions so as to form opposed springcontact tongues 126 extending inward from opposite side walls of thecontacts, as clearly shown in FIGS. 15 through 17 when the contact unitblanks 108 are folded or bent at the short hinge sections 122 and at theopposite ends of the terminal strap portions 124 to form a tubularconfiguration which, preferably, is rectangular in cross-section, asclearly shown in FIGS. 15 through 17.

The opposite ends of the outer and intermediate long transverse portions116 and 118 are provided for purposes of forming connecting or attachingtines 128 and 130. It will be seen that the tines 128 are unitary,whereas the tines 130 are split, as is the side of the contact to whichthe split tines 130 are connected. This split arrangement results fromthe abutting of the side edges of the outer longitudinal transverseportions 118 together, whereby said abutting narrower, outer transverseportions substantially equal in width the width of the intermediatesolid transverse portion 116.

The contact tongues 126 preferably are connected at one end to thefemale contacts adjacent the entrance end of said contacts. Inasmuch asthe tongues 126 extend inwardly toward each other at the unconnectedends thereof, such arrangement provides an effective guiding andcentering means for the reception of the male contact tabs 24 within thelongitudinal passage 22 extending from end to end within the femalecontacts. As it sometimes is desirable to project the male contact tabs24 through the supporting printed circuit board of the module to whichthe female contacts are connected before entering the female contacts,the tines 128 and 130 are arranged to extend axially from the entranceend of the female contact, as shown in FIG. 15. However, if the malecontact tabs 24, or any equivalent type of male contact, are to beinserted into the female contact from the end opposite that which isconnected to the printed circuit board, for example, then the tines 128and 130 are arranged to extend from the end of the female contact 20"which is opposite the entrance end, as shown in FIG. 16.

It thus will be seen that the female contacts shown in FIGS. 15 and 16are both arranged to be positioned vertically or perpendicularly withrespect to the plane of the printed circuit board to which they are tobe connected. However, the selection of the type of female contactrespectively shown in these figures depends upon whether the malecontact tab or equivalent is to be first inserted through the boardbefore entering the female contact or not.

To connect the female contacts to a printed circuit board, the board isfirst provided with an appropriate hole or opening extendingtherethrough for the reception of the tines 128 and 130 adjacentopposite walls of the hole or opening, following which the outer ends ofsaid tines are bent outwardly away from each other so as to clinch thesame against the opposite surface of the board from which the femalecontacts project vertically. Usually, the conductors 18 on one surfaceof the circuit board likewise are apertured in axial alignment with thepassage in the female contacts for purposes of having the tines 128 and130 extend therethrough and when the same are clinched, they engage theconductors 18, as shown in the lower portion of FIG. 1, for example, andpositive connection of said tines with said conductors is assuredthrough the use of solder. Further, inasmuch as the female contactspreferably extend from the same surface of the module boards as theelectrical components mounted upon said boards, as shown in FIGS. 1 and2, it is possible to flow-solder or dip-solder all of the tines, as wellas leads from the electrical components, to the conductors 18 comprisingthe printed circuits, for example, upon the modules 10, whereby a singledipping operation, for example, effects all connections simultaneously.

The foregoing description pertains primarily to vertically disposedfemale contacts 20 and 20". Particularly Where edge connection ofmodules to male contacts, or shorting bars for example, is desired, asin regard to the arrangement shown in FIGS. 2 and 14, the femalecontacts 20 must be disposed with the axis of the passage therethroughparallel to the plane of the printed circuit board. Accordingly, thearrangement shown in FIG. 17 is employed under such circumstances,wherein tines are provided which extend from opposite ends of the femalecontacts, and perpendicularly to the axis of the passage therethrough,both of said tines being split tines 130 because they both extend fromthe split side of the contact 20'.

One of the distinct advantages of this type of female contact having onesplit side and at least one split tine extending therefrom is that whenthe split tines are dis posed in the openings in the supporting printedcircuit board, the opposite walls of such holes or openings engage theouter edges of the split tine 130 and prevent separation thereof, aswell as separation of the split side to which said split tines areconnected. Another precautionary aspect of the female contact resides inthe provision of ears 132, which overlie the outer surfaces of thecontact tongues 126 adjacent the free ends thereof for purposes oflimiting the outward flexing movement of said tongues away from eachother incident to the same engaging a male contact tab, or the like.Said ears 132 are very inexpensively form-ed as a result of severingcertain of the short hinge sections 122 incident to freeing the outerends of the tongues 126 from the blanks to which they otherwise areconnected at the opposite ends of the tongue.

The manner in which the various forms of female contacts are obtainedfrom the contact unit blanks 108 is best illustrated in FIGS. 18 through20, wherein it will be seen that, in FIG. 18, a broken line 134 extendstransversely across the long portions 116 and 118. When the blank 108 issevered along this line, a female contact of the type shown in FIG. isformed. In FIG. 19, a broken line 136 is shown and when the blank 108 issevered along said line, a female contact of the type shown in FIG. 16results. Further, in FIG. short broken lines 138 are shown only inregard to the long intermediate transverse portions of the blank andwhen said blank is severed on these lines, a female contact of the typeshown in FIG. 17 is produced.

It thus will be seen that through the simple expedient of selectingwhere the outer ends of the intermediate and outer long transverseportions are severed from the contact unit blanks 108, three differentspecific types of female contacts, but all basically the same with theexception of the securing tines, are produced. Further, by additionalparticular designing of the contact unit blanks 108, the spring contacttongues 126 are provided, together with the restraining ears 132.

A still further advantage of this particular type of female contact isthat the passage therethrough is open from end to end, whereby anindefinite number of such contacts may be sandwiched or stacked upon asingle continuous length of male contact tab or shorting bar, withoutinterference or difficulty, thereby permitting extremely compactarrangements of modules or other similar electrical units with which theconnecting system comprising the present invention is associated.Further, particularly in regard to the embodiments of female contactsshown in FIGS. 15 and 16, the connecting tines thereof are such thatsaid contacts may be positioned at any desired location upon a surfaceof a printed circuit board for a module, or otherwise, the positioningof such female contacts adjacent one edge, for example, not beingrequired, as in regard to many conventional types of female contacts.

This invention also lends itself to being employed for the connection ofwire to conductors on a printed circuit board. One embodiment of thisaspect of the invention is illustrated in FIGS. 22 and 23. Referring tothese figures, it will be seen that a male contact housing 140 is formedby molding from suitable synthetic resin to provide a plurality ofregularly spaced sockets 142 arranged to receive male contacts 144 ofcomplementary size to be received within the female contacts 146comprising bodies having passages 148 extending entirely therethroughfrom end to end for purposes of slidably receiving and frictionallyengaging the male contacts 144.

The female contacts 146 preferably are identical with the femalecontacts 20" described hereinabove and illustrated in the precedingfigures. The tines 150 thereon also are for a similar purpose to thetines 128 and 130 of said contacts 20.

The end of the male contacts 144 opposite that which is inserted withinthe female contacts 146 is formed with a clinch-type terminal 152 andvarious types of positioning ears 154 which limit the inward movement ofthe male contacts 144 with respect to the sockets 142. Further, a springtongue 156 extends angularly outward at the free end thereof from theplane of the male contacts 144 for purposes of engaging a suitableshoulder within the sockets 142 to prevent withdrawal movement of themale contacts from the housing 140. Such arrangement provides a simpleand effective means for securely anchoring the male contacts 144 withinthe housing 140 and, further, likewise provides a highly effective meansfor connecting a wire 158 to the male contacts, whereby a plurality ofsuch wires 158 may be connected to the housing 140, depending upon thenumber of sockets 142 therein.

Although, in FIG. 22, the housing 140 is shown in three sections, it isto be understood that it is unitary and such illustration is merely forpurposes of foreshortening the view in that such housing may be ofsubstantial length. Further, the housing is provided with a plurality ofbolt-receiving holes 160, there being one bolt 162 shown extendingupward from the intermediate portion of the female contact housing 164.

The female contact housing 164, as in regard to the male contact housing140, is illustrated in fragmentary manner in FIG. 22 to foreshorten theview thereof, and also to illustrate details of the molded sockets 166,which receive the female contacts 146. The lower surface of the femalecontact housing 164 is adapted to be disposed against a surface of aprinted circuit board 168 that is opposite the surface thereof uponwhich conductors 170 are mounted. The tines 150 are clinched against theconductors 170 and preferably are soldered thereto. Adjacent theentrance end of the sockets 160, a molded shoulder 172 is formed tosecure the entrance end of the female sockets 146 against upwardwithdrawal at the time of withdrawing the male contacts 144 when housingis separated from housing 164, for example.

By virtue of the female sockets 146 having a passage 148 entirelytherethrough. as well as the particular design of the socket 166 whichreceives such female contacts and permits axial movement entirelythrough the female contact, it is possible to utilize male contacts ofsubstantial length and thereby effect secure engagement thereof by thetongues 174 provided at opposite sides of the female contacts 146, as inregard to the tongues 126 of the female contacts described hereinabove.

It also will be noted that the sockets in the male contact housing 140and sockets 166 in the female contact housing 164, are disposed in astaggered arrangement, particularly to facilitate the connecting of thetines with adjacent conductors as is especially evident from FIG. 23. Bysuch an arrangement, a compact positioning of the sockets and contactswith respect to each other for a given linear length of the housings 140and 164 is possible.

From the foregoing. it will be seen that the present invention providesa highly effective, yet very simple arrangement of male contacts whichmay be plugged through a printed circuit card or board, for example,into a female contact which has a passage therethrough from end to end,whereby substantially unlimited stacking of printed circuit boards, forexample, is possible if male contacts of appropriate area, a relativelylow cost module system is possible, simply by mounting the electricalcomponents of the modules directly upon the surface of the printedcircuit boards opposite that surface upon which the conductors areplaced. Further, by arranging the securing tines of the femaleconductors so as to be clinched against the conductor surface of theprinted circuit board, the female contacts, as well as the leads fromthe various electrical components, all may be effectively secured to theconductors of the printed circuit board by dip or flow-soldering,thereby minimizing cost.

Unique constructions also are provided in both the male and femalecontacts. The male contact, essentially comprising a stamping formedfrom sheet metal in arrangements generally resembling an l-I-shapcd,designed so that it is possible to expend certain of the prongscomprising the opposite ends of the sides of the H-shaped male contact,even only leaving one tab of the male contact projecting, if the circuitarrangements require this. By eliminating the tabs projecting from oneedge of the transverse bar of the male contacts, a U-shaped male contactresults. Various other configurations and arrangements obviously arepossible, as illustrated in certain figures of the drawings anddescribed in detail hereinabove.

Regarding the female contacts, at least three different arrangements aremade possible from a single type of relatively inexpensive contact unitblank formed in a blanked strip. Simply by severing the contact unitblanks from the margin strips of the blanked strip, the individualcontact unit blanks may be suitably arranged through selected severing,particularly to form the connecting tines either at one end-or the otherof the female contact, or with both tines extending laterally from thesame side, but at opposite ends of the contact, thereby affordingsubstantial latitude for the formation of a selected range of femaleebntacts'from a single pattern of contact unit blanks.

"While the invention has been described and illustrated in its severalpreferred embodiments, it should be understood that the invention is notto be limited to the precise details herein illustrated and describedsince the same may be carried out in other ways falling within the scopeof the invention as claimed.

What is claimed is:

1. Electrical connecting means for coupling electrical modules tocircuit conductors and comprising in combination, module board unitshaving means by which electrical elements may be connected thereto andcircuit conductors attached thereto, female contacts having passagesextending longitudinally therethrough, tines projecting from saidcontacts and extending through said board units to connect the contactsthereto, elongated insulating base members having recesses therein, malecontact members comprising support portions and tabs extendingtherefrom, said support portion being positioned within said recessesfor support thereby and said tabs projecting perpendicularly from saidbase members for longitudinal reception of certain of said tabs withinthe passages of said female contacts, and plate-like supporting meansagainst one surface of which said base members are connected, certainother of said tabs on said male contacts extending through said basemembers and supporting means to secure the same together.

2. The electrical connecting means set forth in claim 1 furthercharacterized by said male contact having tabs extending in oppositedirections from said support portions of said male contact members andengaging respectively female contacts separated by said plate-likesupporting means.

3. The electrical connecting means set forth in claim 2 furthercharacterized by said plate-like supporting means comprising asheet-like insulator board and the outer ends of certain tabs of saidmale contacts which extend through said board being clinched againstsaid board to secure the same to said insulating base members whichsupport said male tabs.

4. The electrical connecting means set forth in claim 2 furthercharacterized by said plate-like supporting means comprising a metalshielding plate and said insulating base members being mounted onopposite surfaces of said shielding plate in alignment with each other,said plate having an opening to receive tabs therethrough extendingbetween said base members on said opposite surfaces of said shieldingplate and said tabs being spaced from the walls of said opening in saidplate, and said electrical connecting means also including means tosecure said insulating base members against said opposite surfaces ofsaid shielding plate.

5. The electrical connecting means set forth in claim 4 furtherincluding insulating extensions on at least one of said insulating basemembers projecting into the opening in said metal shielding plate and atleast partially surrounding said male contact tabs to insure insulationthereof from said metal shielding plate.

6. The electrical connecting means set forth in claim 4 furthercharacterized by the faces of said insulating base means positionedagainst said shielding plate being similar and each having insulatingextensions thereon extending toward each other and provided with axiallyaligned openings through which said tabs of said male contacts extend toinsure insulation thereof from said shielding plate.

7. The electrical connecting means set forth in claim 4 furthercharacterized by said securing means being independent of said malecontacts and extending through said insulating base members andshielding plate to connect the same as a unit for the coupling of moduleboard units to the opposite surfaces of said shielding plate forreception of the male contacts projecting from said opposite surfaces ofsaid plate within the female contacts connected to said module boardunits either perpendicularly or parallel thereto.

8. Electrical connecting means for connecting one or more electricalmodules having electrical components thereon to circuit means andcomprising in combination, a module circuit board having electricalconductors fixed to one surface thereof for connection to electricalcomponents to be connected to another surface and supported by saidmodule board, female contacts supported by said module board and havinga socket passage extending longitudinally therethrough, said femalecontacts being disposed externally of said module board on the samesurface of said module board as said electrical components, a pluralityof tines extending from each said female contact and extending throughopenings in said module board for connection to said conductors thereon,opposed springlike tongues on opposite sides of said contacts havingcontact surfaces thereon urged toward each other, ears extending fromsaid female contacts and overlying said tongues adjacent the outer endsthereof to limit the outward deflection of said tongues, circuit meansto which said module board is detachably connected, said circuit meansincluding male contact tabs insertable longitudinally through thepassages of said female contacts and frictionally engaged by saidtongues thereof for electrical engagement therewith, said tabs beingfixed to an insulating base member and extending perpendicularlytherefrom.

9. The electrical connecting means set forth in claim 8 furthercharacterized by a pair of said tines extending parallel to each otherand the longitudinal axis from opposite sides of the same end of saidcontact, said tines extending through an opening means in said moduleboard from one surface and clinched against the opposite surface thereofto hold said contact perpendicular to said board.

10. The electrical connecting means set forth in claim 8 furthercharacterized by said female contacts being formed from resilient sheetmetal bent into a tube that is rectangu lar in cross-section to formsaid socket passage and one wall thereof including abutting ends of saidsheet metal, and said spring-like tongues being formed in opposed sidewalls not including said abutting ends.

11. The electrical connecting means set forth in claim 8 furthercharacterized by said tines on the female contact projectingrespectively from the opposite ends thereof and extending transverselyto the axis thereof, said tines extending through openings in the moduleboard to hold one wall of said female contact against said board withthe axis of said passage parallel thereto and the outer end of at leastone time being clinched against the circuit means on said module boardand fixed thereto for firm electrical connection therewith.

12. The electrical connecting means set forth in claim 8 furthercharacterized by said female contacts being formed from resilient sheetmetal bent into a tube that is substantially rectangular incross-section to form said socket passage, one wall of said contactbeing split and comprising abutting edges of said bent sheet from whichsaid contact is formed, and at least one end of said split wall having atine formed thereon, whereby said tine is split and the positioning ofsaid split tine in said opening in said module circuit board serving toprevent any appreciable spreading of said tine and split wall of saidfemale socket.

13. A female contact having a longitudinal passage extending completelytherethrough and open from end to end for the reception of a malecontact therethrough, said female contact comprising a generallyrectangular strap portion disposed at each of opposite ends of saidpassage, :1 pair of side walls extending between said strap portions andintegral with each said strap portion, said side walls defining oppositesides of said longitudinal passage, a pair of spring tongues integralwith one said strap portion and extending generally longitudinally fromopposite sides thereof, said spring tongues and said side Wallscooperating to form a generally enclosed passage between said strapportions, said spring tongues being bent inwardly to approach each otheradjacent the free ends thereof, anti overstress means overlying the freeends of said tongues for limiting the outward movement of said tonguesupon insertion of a male contact therebetween, and means extending fromat least one of said strap portions for connecting said female contactto an electrical conductor.

14. A female contact as set forth in claim 13 wherein said last namedmeans comprises a pair of tines extending from opposite sides of thesame end of said contact whereby said contact may be mountedperpendicularly to a board member, said tines being electricallyconnected to electrical conductors on said board member.

15. A female contact as set forth in claim 13 wherein said last namedmeans comprises a pair of lines extending from opposite ends of the sameside of said contact whereby said contact may be mounted parallel to aboard member, said tines being electrically connected to electricalconductors on said board member.

16. A female contact as set forth in claim 13 wherein said last namedmeans comprises a ferrule member extending from one end of said contactand adapted to be crimped to an electrical conductor.

17. Electrical connecting mcans for connecting one or more electricalmodules having clcctricul components thereon to circuit means andcomprising in combination, a module circuit board having electricalconductors fixed to one surface thereof for connection to electrical componcnts to be connected to another surface and supported by said moduleboard, female contacts disposed on said module board and having a socketpassage extending longitudinally therethrOugh, said female contactsbeing disposcd externally of said module board on the some side of saidmodule board as said electrical components, tinc means extending fromeach said female contact and extending through openings in said modulebound for connection to said conductors thereon, circuit means to whichmodule board is detachably connected, said circuit means including malecontact tabs insertable longitudinally through the passages of saidfemale contacts for electrical engagement therewith, said tabs beingfixed to an insulating base member and extending perpendicularlytherefrom.

18. Electrical connecting means for connecting one or more electrical mdules as set forth in claim 17 further said penings in said module boardare in alignment with said socket passages of said female contacts andwherein said male contact tabs are insertable through said openings insaid module board.

19. Electrical connecting means for connecting one or more electricalmodules as set forth in claim: 17 further comprising an insulatingltousing disposed on said module board and containing said femalecontacts.

20. A female contact having a longitudinal passage extending completelytherethrough and open from end to end for the reception of a malecontact thercthrough, said female contact comprising a generallyrectangular strap portion disposed at each of pposite ends of saidpassage, a pair of side walls extending between said strap portions andintegral with each said strap portion, said side walls defining oppositesides of said longitudinal passage, a pair of spring tongues integralwith ne said strap portion and extending generally longitudinally fromopposite sides thereof, said spring tongues and said side wallscooperating to form a generally encl sed passage between said strapportions, said spring tongues bcing bcnt inwardly to approach each otheradjacent the free ends thereof, and means extending from: said femalecontact for connecting said female contact to an electrical conductor.

21. A. female contact as set forth in claim 20 wherein said last namedmeans extends from at least ne of said strap portions.

22. A female contact as set forth in claim 20 further comprising meansfor limiting the outward movement of said tongues upon insertion of amale contact thembetween.

23. A female contact as set forth in claim 22 wherein said limitingmeans is associated with the free ends of said tongues for preventingthe over-stressing of said tongues.

24. A female contact as set forth in claim 20 wherein said last namedmeans comprises tine means extending from one end of said female contactand adapted to be passed thr ugh an aperture in a board member.

25. A. female contact as set forth in claim 20 wherein said last namedmeans comprises a ferrule member extending from one end of said contactand adapted to be crimped to an electrical conductor.

26. Electrical connecting means for connecting ne or more electricalmodules having electrical components thereon to circuit means andcomprising in combination, a module circuit board having electricalconductors fixed to one surface thereof for connecting to electricalcomponcnts to be connected to another surface add supported by said mdule board, a plurality of female contacts regularly spaced along saidmodule board, each said female contact having a socket passage extendinglongitudinally thcrethrough, said female contacts being disposedexternally of said module board on the same side f said module board assaid electrical components, line means extending from each said femalecontact and extending through said module board for connection to saidconductors thereon, and circuit means to which said module board isdctuchably connected, said circuit means comprising a plurality of molecontact tabs inscrtublc longitudinally through said passages in saidfemale contacts for electrical engagement therewith, an insulating basemember supporting said tabs in regularly spaced relation, supportingmeans for supporting said insulating base member, and means for securingsaid base member to said supporting means.

27. Electrical connecting means as set forth in claim 26 furthercomprising openings in said module board in alignment with said socketpassages of said female contacts for receiving said male contact tabsthercthrough.

28. Electrical connecting means as set forth in claim 26 wherein eachsaid female contact further c mprises spring-like tongues having contactsurfaces thereon for frictionally engaging said male contact tabs.

29. Electrical connecting means for coupling electrical modules tocircuit conductors and comprising in c mbination, module board unitshaving means by which electrical elements may be connected thereto andcircuit conductors attached thereto, female contacts having passagesextending longitudinally thcrethr ugh, tines projecting from saidcontacts and extending through said board units to connect the contactsthereto, elongated insulating base members having recesses therein, malecontact members being positioned within said recesses and projectingperpendicularly from said base members f r longitudinal reception withinthe passages of said female contacts, plate-like supporting meansagainst which said base members are connected, and means associated withsaid base members for securing said base members to said supportingmeans.

30. Electrical connecting means as set forth in claim 29 furthercharacterized by said male contact members extending in oppositedirections fr m said base members and engaging respectively femalecontacts separated by said plate-like supporting means.

References Cited The following references, cited by the Examiner, are ofrecord in the patented file of this patent or the original patent.

UNITED STATES PATENTS 2,166,879 7/1939 Wagstaff 339258 2,540,037 1/1951Vough et a]. 339258 2,778,097 1/1957 Berg 29-193.5 2,869,090 1/1959Johanson 33917 2,871,551 2/1959 Harris 29193.5 2,913,634 11/1959Scoville 317-101 2,936,407 5/1960 Ewald 33917 X 2,967,285 1/1961 Freitas339-18 2,992,403 7/1961 Hawk 33917 X Higgs 339-17 X Baschkin 33918Olsson et a1. 339258 X Hochheiser 33917 Dupre 3391 X De Masi 33917 XFOREIGN PATENTS Great Britain. Great Britain.

ROBERT K. SCHAEFER, Primary Examiner J. R. SCOTT, Assistant Examiner USCl. X.R.

mg UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION March 2M, 1970Patent No. Reissue 26837 Dated Inventm-G) William Robert Evansabove-identified patent It is certified that error appears in the d asshown below:

and that said Letters Patent are hereby correcte Column 15, line L b,after "means to which" insert said Column 15, line 53, delete "further"and insert wherein AUG 4 -4970 Attest:

Edward M. Fletcher, Ir.

Attcsting Officer mm E. SGHUYIE JR- Gomissionar of Patents AMP 2664

